214 



PSYCHE. 



[June, 1901 



same time the front legs are modified as 

 in the males. In other respects it is 

 normal. Thus the front part of the body 

 resembles the normal male, while the 

 abdomen is exactly like that of the 

 female. This case may be called " tan- 

 dem " hermaphroditism. The figure 

 illustrates the anomaly, together with 

 the condition in a normal male, and a 

 front leg of a normal female. 



Although gyandromorphism is by no 



Hilara wheeleri n. sp. Male. 



means unknown among insects, it nearly 

 always occurs in the form of lateral 

 hermaphroditism, as observed more com- 

 monly among Lepidoptera and less so 

 among bees and ants. The occurrence 

 of antero-posterior, or " tandem " herm- 

 aphroditism is rather rare, although 

 quite as interesting as other cases of 

 blending of sex. In this connection 

 " Hahnenfedrigkeit" among female 

 birds may be recalled. 



As this species of Hilara has not 



been described, its diagnosis may prop- 

 erly be given in this connection. 



Hilara Wheeleri sf. 7iov. Male and fe- 

 male. Length 3.5 mm. Opaque true-black, 

 covered with a very fine grej-glaucous coat- 

 ing. Head, thorax and abdomen with a few 

 pale short hairs besides the dark bristles. 

 Antennae black, short, third joint short, con- 

 ical, its arista equal to itself. Palpi testa- 

 ceous, with pale hairs : proboscis piceous, 

 generally less than one-half the head-height. 

 Thorax not vittate, its short hairs irregularly, 



Hilara wheeleri n. sp. Gynandromorphic individual. 

 The detached leg is the fore leg of a normal female. 



almost serially arranged : scutellum with 

 four bristles, the inner pair long. Abdomen 

 opaque black, most often compressed in the 

 male and cylindrical or depressed in the fe- 

 male : no conspicuous bristles, the short 

 sparse pubescence pale : hypopygium not of 

 greater depth than the abdomen, sessile, 

 rarely distinctly separated from the abdo- 

 inen above, compressed, its lateral valves 

 sub-glabrous, the dorsal filament thick, but 

 almost always hidden. Legs fuscous to 

 piceous. The males, as a rule, have the legs 

 darker, but the fore tibiae are always fuscous. 

 The pubescence is pale yellow : no conspic- 

 uous macrochaetae are present, though the 



